Drill-sharpener.



l. DITSON.

DRILLSHARPENER.

APPLICATION FILED MAR. 12. 191?.

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Patented Mar. 12, 1918.

2 SHEETS-SHEET I.

J. D|TSON., DR ILL SHARFENER.

APPLICATION HLED MAR-13, 1917- 1,258,999. I Patented Ma1-.12,1.91& v 2 SHEETS-*SHEET 2- 3 mum W01;

UNITED STATES PATENT OFFICE.

JESSE DITSDN, OF LITTLETON, COLORADO, ASSIGNOR TO THE J. GEO. LEYNER- ENGINEERING WORKS COMPANY, 01? LITTLETON, COLORADO, A CORPORATION" OF COLORADO.

DRILL-SHARPENEB.

Specification of Letters Patent. Patented Mar, 12, 1918.

Application filed March 13, 1917. Serial No. 154,448.

To all whom it may concern Be 1t known that I, Jesse Drrsou, a citizen of the United States, residing at Littleton, in the county of Arapahoc and State of Colorado, have invented a certain new and useful Improvement in Drill Sharpeners, of which the following is a specification.

This invention relates to drill. sharpcners and especially to that type of sharpener in which the drill steel is held between the jaws of a vise by fluid or pneumatic pressure.

The objects of my invention are to improve the operation of the vise and to cushion the downward thrust of the upper jaw of the vise upon closing of the same.

With these and other objects in view my invention consists in the various details of" construction brought out in the following specification and claims.

In the drawings forming a part of this application,

Figure 1 is a complete vertical view of my drill sharpener shown partly in section,

Fig. 2, a vertical sectional view of the cushioning valve,

Fig. 3-, a top plan view of this valve, and

Fig. 4-, a horizontal sectional view of the cushioning valve taken on the line X-X of Fig. 2.

The construction of my drill sharpener comprises a base 1 which may be attached in any manner to the floor but preferably is attached by means of lag screws 2 extend ing through holes 3 drilled through the lower part of the base 1. The base 1 is provided with a flange 4 in its upper part whose upper surface 5 provides a seat for the cylinder 6 which is fastened to the flange 4- by means of screws 11. The base is also provided in its central portion with a cylinder 12 in which operates the stem 7 of a piston 8. The piston 8, which is in the form of a disk and of larger diameter than the stem 7, slides in the cylinder 6 and through the medium of one or more posts 9. fastened to the piston raises and lowers the cross head 10 in which is formed the upper half of the die receiving socket 13, the lower half of the die receiving socket 141 being formed in the anvil blockf15 formed with the cylinder 6. The stem 7 and piston 8 are operated by means of fluid or pneumatic pressure from any suitable source which is distributed and controlled by valve 16 operating in valve chest 17 and controlled by means of a handle 18 through the medium of the rack at one end of the valve 16.

In the position shown in Fig. 1, the fluid under pressure is being admitted to the upper face of the piston 8 through port 21 and being exhausted from the cylinder 12 through port 22. Thus the cross head is about to descend to bring the upper and lower jaw members together. In order that the piston. 8 together with the cross head 10 and upper jaw member may not be brought down against the anvil block 15 with such a great impact thatit would unduly jar the machine, I place in the port 22 a cushion valve 23 which will restrict the opening of the cylinder 12 into the port 22 and thus allow the fluid to pass but slowly from the cylinder 12. The valve 23 is made up of a. casing 24 screw threaded into position in the frame 1, the casing being provided with several openings 25 in its upper face to allow the fluid to enter freely into the cylinder 12 when the valve is open and an internally threaded section 26 in which is threaded and allows fluid to pass only through the very small openings 29 when the fluid is exhausting from cylinder 12. It will thus be seen that this valve 23 automatically closes and allows fluid to escape from cylinder 12 but very slowly and thus prevents the too sudden closing and consequently the too greatimpact of the cross head 6 against the anvil block 15.

It is to be understood that the present showing and description discloses only one modification of my invention and that other forms and modifications are included in the spirit and scope of the invention as expressed in the following claims.

What I claim is:

1. In a fluid operated vise, in combination, a base, a. stationary vise member, a movable vise member, a piston for' raising and lowering said movable vis'e member and a cushioning valve for retarding the lowering of said movable vise member located within the base of said vise. i

In a fluid operated vise, in combination, .a base, a 'stationary vise member, a

. movable vise inember, a piston for raising movable within a cylinder in said base for raising and lowering ,said movable vise member, and a valve inserted within the base to permit a free flow of fluid in one direction to raise said movable viseinember anda restricted flow of fluid in the opposite direction to retard and cushion the (downward movement oi said movable vise member.

In testimony whereof, I have hereunto set my hand.

JESSE nrrsoN. 

